4 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
This boiler uses LED flash patterns
Count the flashes in one repeating group before the pause. That number is your fault code. Do not reset until you have noted it. How to read fault codes →
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Your boiler has failed to start after three attempts, likely because it is struggling to find a stable gas supply or has air trapped in the system.
Your boiler has detected that it is running too hot and has automatically shut itself down to prevent damage.
Your boiler has stopped working because it failed to ignite, which means it is currently unable to provide you with any heating or hot water.
Your boiler has stopped working for safety reasons and has locked itself to prevent starting until a professional technician can investigate the internal fault.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes